Physics Lesson 4 1 Please read these instructions before you begin to answer the questions that follow 3 A spring is stretched 3 cm by a force of 12 N. How far would the spring have to be stretched to produce a potential energy of 0.143 J? This paper exam is here for your convenience. Your final answers must be submitted through our app. You may complete the exam direct on file provided in the app or upload a copy of this handwritten effort. When you are satisfied that your answers are correct, use the app to download a file for this lesson, complete and submit to your teacher for grading. Only answers included on the submitted file will be considered for grading. Note that diagrams are not necessarily drawn to scale. Each question is worth two points unless otherwise noted. Think carefully and remember there are no "trick" questions. 1. Sound waves travel approximately 340 m/s through the air. What is the wavelength of a sound 4. What is the length of a simple pendulum with a period of 1 1.5 s? (Hint: Use gravitational wave that has a frequency of 192 Hz ? field, g = 9.8 N/kg) Jen eldT + 2. Sound has a speed of about 3200 m/s in copper. What is the wavelength of the sound wave in question 1 after it crosses into a copper medium? Keep in mind that the frequency of a wave does not change when it enters a new medium. For statements 5-6 below, write true or rewrite the italicized part to make the statement true. in The period of a wave is determined by the medium through which the wave moves. wolves A nosesd and aised voy sidled A In destructive interference, a point that experiences no cigardo does to line displacement is called a trough